![]() ![]() The rake angle is generally selected between -5°and 25°. ![]() Secondly, according to the nature of the processing to consider the size of the front angle, the rake angle takes a small value when rough machining while a large value is taken in finishing machining. If the hardness of the material to be processed is high, the rake angle takes a small value, while taking a large value on the opposite. Therefore, the first step is to choose a rake angle need to be base on the hardness of the hard-to-be-cut material. The size of the rake angle mainly resolves the conflict between the firmness and sharpness of the bit. Main geometric angles and selection of lathe tool s 1) Principle of rake angle (γ0 ) selection ![]() It can be seen that these three coordinate planes are perpendicular to each other, forming a space rectangular coordinate system. ![]() 1) Cutting planeĪ plane that cuts at a selected point on the main cutting edge and is perpendicular to the base plane of the shank.Ī plane that passes through a selected point of the main cutting edge and is parallel to the bottom surface of the shank.Ī plane that is perpendicular to the cutting plane and perpendicular to the base plane. The three auxiliary planes are cutting plane, base plane and orthogonal plane. In order to determine and measure the geometric angle of the lathe tool, three auxiliary planes need to be selected as the benchmark. Auxiliary plane for measuring the cutting angle of the lathe tool The tool tip is actually a small curve or straight line, which is also called the rounding tool tip and the chamfering tool tip. The cutting part of the lathe tool consists of rake face, main flank face, secondary flank face, main cutting edge, secondary cutting edge and tool tip.ġ) Rake face: The surface through which the chips on the tool flow.Ģ) Main flank face: the surface on the tool that opposes and interacts with the machined surface on the workpiece.ģ) Secondary flank face: the surface on the tool opposite and interacting with the machined surface on the workpiece.Ĥ) Main cutting edge: the intersection line between the rake face of the tool and the main flank.ĥ) Secondary cutting edge: the intersection line between the rake face of the tool and the counter flank.Ħ ) Tool tip: the intersection of the main cutting edge and the secondary cutting edge. 5) The principle of inclination angle (λS) selection The composition of the cutting part of the lathe tool.4) The principle of the secondary deflection angle (Kr’) selection.3) Principle of cutting edge angle (Kr ) selection.2) The principle of back angle (α0 ) selection.1) Principle of rake angle (γ0 ) selection.Main geometric angles and selection of lathe tools.Auxiliary plane for measuring the cutting angle of the lathe tool.The composition of the cutting part of the lathe tool. ![]()
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